Presentation on theme: "Sketches and Working Drawings"— Presentation transcript:
1 Sketches and Working Drawings Sketches are freehand drawings of an object for a project done in order to get the idea down on paper.Sketches are not usually drawn to scale.Neatly drawn sketches with fairly accurate dimensions are usually sufficient for simple projects.Sketches of larger and more complicated projects can serve as the basis for accurate working drawings.Working drawings are complete drawings done in universal graphic language so that the object depicted can be constructed from the drawing alone without additional information.Dimensions - Working drawings use lines scaled to the dimensions of the actual objects.Views - Working drawings show specific views of an object with enough detail to enable project construction.`Most working drawings show three separate sides of an object from three flat, head-on views.Pictorial drawings show three sides of an object together in one view.
2 About Building Plans Are like maps Provide important information DimensionDirectionHeightsHave standard symbols & signsDrawn to scaleGive different views & sections
3 Building Plans Have: Position of boundary pegs Boundary lines Building linesWalls & fixturesHeightsPegsNatural ground level (NGL)Finished ground level (FGL)Finished floor level (FFL)Cardinal directionPlot numberOther specific information
4 Drawing to ScaleScale drawing permits the size of the object to be reduced proportionally in order for it to be drawn on the size of paper chosen.Common scales of a drawing may be 1mm, 10mm, 50mm, 100mm, to represent one metre. For example, 10mm = 1 metre.A scale rule is the most common type of scale used for drawing scale projects.Its main divisions at the end of the scale, which are in centimetres or millimetres, represent one metre.The divisions may be subdivided into smaller parts
5 Let’s balance things out Scale:Standard scale is1 : 100Sometimes1 : 50Site Plans often1 : 500Let’s balance things out
6 Types of Lines Used in Drawings a. Border line: a heavy, solid line drawn parallel to the edge of thedrawing paper.b. Object line: a solid line representing the visible edges and formof an object.c. Hidden line: a series of dashes which indicate the presence ofhidden edges.d. Dimension line: a solid line with arrowheads at both ends toindicate the length, width, or height of an object.e. Extension line: a solid line indicating the exact area specifiedby a dimension.f. Break line: a solid, zigzag line which indicates that part of theobject being drawn is not fully illustrated or has been left out.g. Center line: a long-short-long line used to depict the center of around object.h. Leader line: a solid line with an arrow pointing from anexplanatory note to a specific feature of an object.